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Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ (32,323) | $ (10,380)
Notional Amount | 2,725,884 | 1,488,922
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 7,514 | 7,787
Notional Amount | 1,121,914 | 859,360
Derivative Assets | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value | 4 | 5,972
Notional Amount | 4,000 | 268,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 3,294 | 1,138
Notional Amount | 498,000 | 241,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 1,921 | 596
Notional Amount | 265,000 | 340,000
Derivative Assets | CMBX |  |
Derivative [Line Items] |  |
Fair Value | 588 |
Notional Amount | 25,000 |
Derivative Assets | Loan Purchase Commitments |  |
Derivative [Line Items] |  |
Fair Value | 1,707 |
Notional Amount | 329,914 | 360
Derivative Assets | Loan forward Sales Commitments |  |
Derivative [Line Items] |  |
Fair Value |  | 81
Notional Amount |  | 10,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (39,837) | (18,167)
Notional Amount | 1,603,970 | 629,562
Derivative Liabilities | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value | (1,918) | (80)
Notional Amount | 291,500 | 50,500
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (5,540) | (661)
Notional Amount | 751,500 | 235,000
Derivative Liabilities | Loan Purchase Commitments |  |
Derivative [Line Items] |  |
Fair Value | (45) | (379)
Notional Amount | 49,565 | 42,562
Derivative Liabilities | Loan forward Sales Commitments |  |
Derivative [Line Items] |  |
Fair Value | (1,121) |
Notional Amount | 245,905 |
Derivative Liabilities | Futures |  |
Derivative [Line Items] |  |
Fair Value | (494) | (528)
Notional Amount | 126,000 | 162,000
Derivative Liabilities | Cash Flow Hedging | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Fair Value | (30,719) | (16,519)
Notional Amount | $ 139,500 | $ 139,500

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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